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6-1 6. SIMULATION OF TRANSFER FUNCTION USING OP-AMPS AIM: To simulate the transfer function using Op-Amps, by using the circuits Integrator, Non inverting amplifier and summing amplifier. APPARATUS: Op- Amps IC -741 -3 NO’S Capacitor 0.1μF -1 No. Resistor 10 KΩ -5 No’s 2 KΩ- 2 No.’s 100KΩ- 1 No. Function Generator, CRO & probes, connecting wires. THEORY: 1. Op-amp is a operational amplifier, which performs arithmetic operations. 2. Op-amp pin configuration contains 8-pins, generally it is IC 741 3. In 741 second and third pins are inverting and non-inverting pins, it is operated in conduction mode by giving biasing voltages - VEE and VCC to the 4th and 7th pins respectively. 4. It is a high gain amplifier. 5. In inverting mode the phase shift between input and output is 1800, where as in non-inverting mode the input and output signals are in phase. 6. In integrator circuit output is integration of input signal. CIRCUIT DIAGRAM: Fig (i) 6-2 PROCEDURE: 1. Connect the circuit as per the circuit diagram shown in fig (i). 2. A square wave input is given to both the integrator and non inverting amplifier circuits. 3. +Vcc and –Vee are applied as +10v and -10v at 7 and 4 pins respectively for every circuit shown in the circuit diagram. 4. Individual out puts V01 and V02 of integrator and non inverting amplifier are summed by using a summing amplifier which is shown in figure. 5. The output waveform of integrator, non-inverting amplifier and summing amplifier are observed and plotted on the graph THEORITICAL CALCULATIONS:-. For the integrator circuit, R - f R K 10 T1 1 1 sR f C (1 sR f C ) (1 .01s) For the Non- inverting amplifier, T2 1 R f R1 2 For summing amplifier T T1 T2 2- 10 (1 .01s) 6-3 MODEL GRAPH: RESULT: The transfer function of the op-amp was simulated.